HVAC Systems

Heat-recovery ventilators can keep up to 80% of the energy in exhaust air inside a house, saving conditioned air and the money spent to heat or cool it.by Rob Yagid

In a dense urban neighborhood, this remodeled bungalow goes green with recycled materials, solar energy, gray water, and room for the owners’ day jobsby Geoffrey Holton

21st-century technology and a classic look come together in a shingle-style house that produces more energy than it consumesby Bill Heigis, Hobie Guion

A first-time home designer nails it with an updated farmhouse that includes double-duty spaces, a serious mudroom, and a five-star energy ratingby Diane Kolak

Here’s how to spot the signs and boost the efficiency of your furnace, boiler, or heat pumpby Dave Yates

by Bob Romano

Look over the shoulder of an expert installer as he fastens panels to the roof and explains how the system worksby Scott Andrews

This home uses five systems to reduce its environmental impact, lower its operating cost, and improve its connection to the landby James Tuer

by Charles Peterson

Using factory-assembled pieces and swapping a boiler for a water heater can lower the cost of radiant-floor heating systemsby Scott Gibson

Inspecting a house for inefficiencies is the first step toward optimized comfort and minimized utility costsby Jefferson Kolle

by Jim Benton

BuildingGreen.com has an interactive online calculator to make comparing fuel costs simpleby Chris Ermides

A forward-thinking homeowner invests in a highly efficient HVAC system that includes photovoltaics and a noncombustion furnace

Requirements: 1 metal roof, 2500 gallons of rain, and the desire to save the planet

Get an in-depth look at a near-zero energy house featuring recycled materials and solar-heating and rainwater-harvesting systems

Video tours and takeaways from Portland's Build It Green! 2008 event

Today’s exhaust fans quietly mitigate moisture, promote health, and save energy with smart switchesby Jefferson Kolle

From wrapping your tank to tapping the sun: Six ways to put your water heater on an energy dietby Dave Yates